Citadel bosses one-shotting when they really shouldn't be?

3k life with 26k armor for both phys and ele. Geonor is overtuned for sure, if i don't play perfectly he destroys my character even wihtout damage mods.

I'm running Explosive Shot / Shockburst Titan so i can't get much more armor, maybe i should get a Brass Dome although i like my ornament plate so much (2k armor / 200 life / regen implicit for berserk).

Life - Armor is kinda useless for significant hits unless you can reach around 50/60k armor. I regret investing in this character even though i really enjoy it.

I don't have many problems with other bosses but some of his attacks deal too much damage for the dodge window indeed.

This is the kind of situation that frustrates me enough to go back to PD2.
I really hope GGG nerfs him a bit so i can play something other than 15-20k ES builds or even HC.